110 lines
3.5 KiB
JavaScript
110 lines
3.5 KiB
JavaScript
// Functions to imitate the behavior of Downsize@0.0.5 with 'words: "0"' (heavily based on Downsize)
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var stack, tagName, tagBuffer, truncatedText, parseState, pointer,
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states = {unitialized: 0, tag_commenced: 1, tag_string: -1, tag_string_single: -2, comment: -3},
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voidElements = ['area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input',
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'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'];
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function getTagName(tag) {
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var tagName = (tag || '').match(/<\/*([a-z0-9\:\-\_]+)/i);
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return tagName ? tagName[1] : null;
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}
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function closeTag(openingTag) {
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var tagName = (getTagName(openingTag)) ? '</' + getTagName(openingTag) + '>' : '';
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return tagName;
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}
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function downzero(text) {
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stack = [];
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tagName = '';
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tagBuffer = '';
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truncatedText = '';
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parseState = 0;
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pointer = 0;
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for (; pointer < text.length; pointer += 1) {
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if (parseState !== states.unitialized) {
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tagBuffer += text[pointer];
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}
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switch (text[pointer]) {
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case '<':
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if (parseState === states.unitialized && text[pointer + 1].match(/[a-z0-9\-\_\/\!]/)) {
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parseState = states.tag_commenced;
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tagBuffer += text[pointer];
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}
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break;
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case '!':
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if (parseState === states.tag_commenced && text[pointer - 1] === '<') {
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parseState = states.comment;
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}
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break;
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case '\"':
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if (parseState === states.tag_string) {
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parseState = states.tag_commenced;
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} else if (parseState === states.tag_string_single) {
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// if double quote is found in a single quote string, ignore it and let the string finish
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break;
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} else if (parseState !== states.unitialized) {
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parseState = states.tag_string;
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}
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break;
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case '\'':
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if (parseState === states.tag_string_single) {
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parseState = states.tag_commenced;
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} else if (parseState === states.tag_string) {
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break;
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} else if (parseState !== states.unitialized) {
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parseState = states.tag_string_single;
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}
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break;
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case '>':
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if (parseState === states.tag_commenced) {
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parseState = states.unitialized;
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truncatedText += tagBuffer;
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tagName = getTagName(tagBuffer);
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if (tagBuffer.match(/<\s*\//) && getTagName(stack[stack.length - 1]) === tagName) {
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stack.pop();
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} else if (voidElements.indexOf(tagName) < 0 && !tagBuffer.match(/\/\s*>$/)) {
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stack.push(tagBuffer);
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}
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tagBuffer = '';
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continue;
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}
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if (parseState === states.comment && text.substring(pointer - 2, pointer) === '--') {
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parseState = states.unitialized;
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truncatedText += tagBuffer;
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tagBuffer = '';
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continue;
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}
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break;
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case '-':
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break;
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}
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if (!parseState) {
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break;
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}
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}
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truncatedText += tagBuffer;
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while (stack.length) {
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truncatedText += closeTag(stack.pop());
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}
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return truncatedText;
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}
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module.exports = downzero;
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